python 安装第三方库的时候出现 UnicodeDecodeError: 'utf8'

新手。请指导。感激不尽。无以为报

1. pip – http://pypi.python.org/pypi/pip
2. distribute – http://pypi.python.org/pypi/distribute
3. nose – http://pypi.python.org/pypi/nose/
4. virtualenv – http://pypi.python.org/pypi/virtualenv

安装4个包。
期间安装了easy_install ，就是setuptools

用下载压缩包加压 Powershell 输入 python setup.py install 这个方法安装提示
PS C:\Users\Jerry-Wu\pythonku\nose-1.3.3> python setup.py install
Traceback (most recent call last):
File "setup.py", line 27, in <module>
from setup3lib import setup
File "C:\Users\Jerry-Wu\pythonku\nose-1.3.3\setup3lib.py", line 2, in <module>
from setuptools import setup as _setup
File "C:\Python27\lib\site-packages\setuptools\__init__.py", line 2, in <module>
from setuptools.extension import Extension, Library
File "C:\Python27\lib\site-packages\setuptools\extension.py", line 5, in <module>
from setuptools.dist import _get_unpatched
File "C:\Python27\lib\site-packages\setuptools\dist.py", line 15, in <module>
from setuptools.compat import numeric_types, basestring
File "C:\Python27\lib\site-packages\setuptools\compat.py", line 19, in <module>
from SimpleHTTPServer import SimpleHTTPRequestHandler
File "C:\Python27\lib\SimpleHTTPServer.py", line 27, in <module>
class SimpleHTTPRequestHandler(BaseHTTPServer.BaseHTTPRequestHandler):
File "C:\Python27\lib\SimpleHTTPServer.py", line 208, in SimpleHTTPRequestHandler
mimetypes.init() # try to read system mime.types
File "C:\Python27\lib\mimetypes.py", line 358, in init
db.read_windows_registry()
File "C:\Python27\lib\mimetypes.py", line 258, in read_windows_registry
for subkeyname in enum_types(hkcr):
File "C:\Python27\lib\mimetypes.py", line 249, in enum_types
ctype = ctype.encode(default_encoding) # omit in 3.x!
File "C:\Python27\lib\encodings\utf_8.py", line 16, in decode
return codecs.utf_8_decode(input, errors, True)
UnicodeDecodeError: 'utf8' codec can't decode byte 0xb0 in position 1: invalid start byte
PS C:\Users\Jerry-Wu\pythonku\nose-1.3.3>

用easy_install nose 提示为
PS C:\Users\Jerry-Wu\pythonku\nose-1.3.3> easy_install nose
Traceback (most recent call last):
File "C:\Python27\Scripts\easy_install-script.py", line 9, in <module>
load_entry_point('setuptools==1.1', 'console_scripts', 'easy_install')()
File "C:\Python27\lib\site-packages\pkg_resources.py", line 357, in load_entry_point
return get_distribution(dist).load_entry_point(group, name)
File "C:\Python27\lib\site-packages\pkg_resources.py", line 2394, in load_entry_point
return ep.load()
File "C:\Python27\lib\site-packages\pkg_resources.py", line 2108, in load
entry = __import__(self.module_name, globals(),globals(), ['__name__'])
File "C:\Python27\lib\site-packages\setuptools\__init__.py", line 2, in <module>
from setuptools.extension import Extension, Library
File "C:\Python27\lib\site-packages\setuptools\extension.py", line 5, in <module>
from setuptools.dist import _get_unpatched
File "C:\Python27\lib\site-packages\setuptools\dist.py", line 15, in <module>
from setuptools.compat import numeric_types, basestring
File "C:\Python27\lib\site-packages\setuptools\compat.py", line 19, in <module>
from SimpleHTTPServer import SimpleHTTPRequestHandler
File "C:\Python27\lib\SimpleHTTPServer.py", line 27, in <module>
class SimpleHTTPRequestHandler(BaseHTTPServer.BaseHTTPRequestHandler):
File "C:\Python27\lib\SimpleHTTPServer.py", line 208, in SimpleHTTPRequestHandler
mimetypes.init() # try to read system mime.types
File "C:\Python27\lib\mimetypes.py", line 358, in init
db.read_windows_registry()
File "C:\Python27\lib\mimetypes.py", line 258, in read_windows_registry
for subkeyname in enum_types(hkcr):
File "C:\Python27\lib\mimetypes.py", line 249, in enum_types
ctype = ctype.encode(default_encoding) # omit in 3.x!
UnicodeDecodeError: 'ascii' codec can't decode byte 0xb0 in position 1: ordinal not in range(128)